Telephonic apparatus



UNITED STATES PATENT OFFICE.

HOWARD C. PAULY, OF NEW YORK, N. 'Y., ASSIGNOR TO WESTERN ELECTRIC COM- PANY, INCORPORATED, OF NEW YORK. N. Y., A CORPORATION OF NEW YORK.

TELEPHONIC APPARATUS.

Specification of Letters Patent.

Patented Jan. 1'7, 1922.

Application filed August 9, 1918. Serial No. 249,067.

To all whom it may concern:

Be it known that I, HOWARD C. PAULY, a citizen of the United States. residing at New York, in the county of Bronx, State of New York, have invented certain new and useful Improvements in Telephonic Apparatus, of which the following is a full, clear, concise, and exact description.

This invention relates to telephonic apparatus, and more particularly to telephone hand sets.

The principal object of the present invention is to provide a hand set having a telephonic receiver and a telephonic transmitter carried by a common handle, in which the transmission of mechanical vibrations between the receiver and the transmitter and consequent howling of the receiver is prevented. In accordance with this feature of the invention, a hand set is provided having a receiver and a transmitter carried by a common handle and having either the transmitter or receiver or both separated from the handle by energy absorbing materiflTwhich serves to prevent the transmis- .sion of mechanical vibrations tending to pass between such transmitter and receiver through the handle.

Another object of the invention is to pro vide a simple and efficient arrangement to prevent the transmission of mechanical vibrations between a transmitter or receiver casing and the support upon which it is mounted. In accordance with this feature of the invention the casing hasan opening through which means securing the casing to the support extends without engaging the walls thereof, and energy absorbing material is arranged between the casing and securing means, to prevent the transmission of mechanical vibrations between the casing and the handle, and vice versa. If desired, a washer of energy absorbing material may also be positioned between and in engagement with both the support and casing.

The drawing illustrates one embodiment of the present invention as applied to a telephone hand set. Figure 1 a side elevation partly in section, of a hand set constructed in accordance with the invention, and Figure 2 is a cross-section illustrating a similar construction applied to a receiver mounting.

As shown, the hand set comprises a handle 3 of any suitable material, having a receiver 4: secured to one end thereof, and a transmitter 5 secured to the opposite end. A housing 6 serves to enclose the conductors extending to the receiver and the transmitter and is provided at its lower end with an extension 7, through which a cord 8, carrying the conductors for the receiverand transmitter, passes.

It is general for the receiver and transmitter of a station to be connected in associated circuits so that the receiver is operated in accordance with the current fluctuations developed in the transmitter at that station. Should the receiver and transmitter at a station be associated in such a manner thatmechanical vibrations developed in the receiver are transmitted to the variable resistance element of the transmitter, these vibrations tend to vary the transmitter circuit, thus correspondingly increasing the vibrations in the receiver which, in turn, travel back to the transmitter to still further vary the resistance change thereof. This action would tend to continue, still further increasing the vibrations, until the natural frequency of the transmitter and receiver diaphragms is reached, and results in the production of objectionable noises, known as howling at the receiver. It is, accordingly, desirable in hand sets, where the transmitter and receiver are carried by a common handle, that the receiver or the transmitter, or both, be secured to the hair dle in such a way that it will not serve to conduct the vibrations set up in the receiver to the transmitter. This is preferably obtained by mounting the receiver upon the handle in such a way that mechanical vibrations within the receiver will not be transmitted to the handle, inasmuch as the vibrations from the receiver which are transmitted to the variable resistance element of the transmitter through the handle usually initiate the howling action. It is, however, desirable that mechanical vibrations which may bedeveloped in the handle itself should also be prevented from reaching the transmitter, and transmitter 5 has, accordingly, been shown as secured to the handle 3 by means which will absorb the mechanical vibrations tending to pass therebetween. Such a mounting of the transmitter 5 would also serve to absorb any vibrations of the receiver 4: which might be transmitted to the handle 3, and would act in this way independent of whether or not the receiver 4' was secured to the handle 3 in such a way that mechanical vibrations tending to pass therebetween would be absorbed.

The particular means shown in the drawing for preventingthe passage of mechanical vibrations between the receiver and handle, and between the handle and transmitter, consist of energy absorbing washers 9 and 10, arranged, respectively, against the exteriorand interior of the receiver, or transmitter casing 11. These washers maybe of any suitable energy absorbing material, rubber, felt or leather being especially desirable for such use. The washer 9 is posi- 'tioned between and in engagement with both the handle 3 and the exterior of the casing 11, and securing bolts 12, passing through the handle 3, washer 9, openings 13 of the casing 11, washer 10 and a clamping plate 14:, serve to firmly secure the receiver or .transmitter to the handle. The openings 13 are'somewhat larger than the bolts 12 to' prevent engagement of the casing 11 with these bolts, whereby it is impossible for'mechani- 'cal vibrations to be transmitted directly from the casing '11 to any of the bolts 12. The clamping plate 14 engages the inner side of the washer 10, and the openings in the plate 14, provided for the bolts 12, are pref-- erably screw-threaded so that, upon tightening the bolts, the receiver or transmitter, as the case may be, will be firmly secured to the handle 3. In this case, the nuts 15 would serve as lock nuts to prevent accidental loosening of the connection. YVhile it is possible to omit the plate 14 and secure the easing 11 to, the handle 3 through the engagement of the nuts 15 with the inner surface of the washer 10, it, is preferable to use the plate 14;, since abrasion of the washer 10 is thereby prevented.

In order to provide a passage 16 for the necessaryconductors of the receiver 4 or transmitter 5, registering openings will preferably be provided in the handle 3, washer 9, casing 11, washer 10 and plate 14, through which the flexible conductors leading to the receiver 4 or transmitter 5, as the case may be, will extend. 1

What is claimed is:

1. A telephone hand set comprising a transmitter member, a receiver member, a handle common to both members, means to secure one of the members to the handle, means independent of the first mentioned means to secure the other member to-the handle, and energy absorbing material intermediate the handle and the other member and intermediate the other member and the means to secure it to the handle to prevent the transmission of mechanical vibrations between the other member and the handle.

2. A hand set comprising a transmitter, a receiver, a handle common'to the transmitter and receiver, means to secure the receiver to the handle, andenergy absorbing material intermediate the receiver and the means to secure it to the handle to prevent the transmission of mechanical vibrations betweenthe receiver and handle.

3. A hand set comprising a transmitter, a receiver, a handle common to the transmitter and receiver, means to secure the receiver to the handle, energy absorbing'material intermediate the handle and the receiver and intermediate the receiver and the means to secure it to the handle to prevent the transmission of mechanical vibrations between the receiver and handle.-

4. A hand set comprising a transmitter, a receiver, a handle common to the transmitter and receiver, means to secure the transmitter to the handle, energy absorbing material intermediate the transmitter and means to secure it to the handle to prevent the transmission of mechanical vibrations between the handle and the transmitter, means to secure the receiver to the handle, and energy absorbing material intermediate the receiver and the means to secure it to the handle to prevent the transmission of mechanical vibrations between the receiver and handle.

5. A hand set comprising a transmitter, a

secure the receiver to the handle, and energy absorbing material intermediate the receiver and handle and intermediate the receiver and the means to secure it to the-handle to prevent the transmission of mechanical vibrations between the receiver and handle.

6. A hand set comprising a transmitter, a receiver, a handle common to the transmitter and receiver, means to secure the receiver to the handle, means independent of the first mentioned means to secure the transmitter to the handle, and energy absorbing material intermediate the transmitter and the handle an intermediate the transmitter and the means to secure it to the handle to prevent the transmission of mechanical vibrations between the handle and transmitter.

7. A telephonic device comprising a supporting member, a casing having an opening therethrough, means passing through the opening but out ofjcontact' with the walls thereof to secure the casing to the supporting member, and energy. absorbing material intermediate the casing and the securing means to prevent the transmission of me- 8. A telephonic device comprising a supporting member, a casing having an opening therethrough, means passing through the opening but out of contact with the casing to secure the casing to the supporting member,

and energy absorbing material intermediate.

thereof to secure the casing to the supporting member, energy absorbing material intermediate the supporting member and casing and intermediate the casing and securing means to prevent the transmission of mechanical vibrations between the casingand supporting member, and a plate engaging a portion of the energy absorbing material intermediate the casing and securing means but out of contact with the casing; whereby transmission of mechanical vibrations between the casing and supporting member is prevented.

10. A telephonic device comprising a supporting member, a receiver casing having an opening therethrough, means passing through the opening but out of contact with the walls thereof to secure the casing to the supporting member, a washer of energy absorbing material engaging the supporting member and the exteriorof the casing, a washer of energy absorbing material intermediate the casing and the-securing means and engaging the interior of the casing; whereby the transmission of mechanical vibrations between the casing and supporting member is prevented.

11. A. telephonic device comprising a supporting member, a receiver casing having an opening therethrough, means passing through the opening but out of contact with the walls thereof to secure the casing to the supporting member, a washer of energy absorbing material engaging the supporting member and the exterior of the casing, a washer of energy absorbing material intermediate the casing and the securing means and engaging the interior of the casing, and a plate engaging the last mentioned Washer and the securing means but out of contact with the casing; whereby the transmission of mechanical vibrations between the casing and supporting member is prevented.

12. A telephonic device comprising a supporting member, a transmitter casing having an opening therethrough, means passing through the opening but out of contact with the walls thereof to secure the casing to the supporting member, a washer of energy absorbing material engaging the supporting member and the exterior of the casing, a

wvasher of energy absorbing material intermediate the casing and the securing means and engaging the interior of the casing;

whereby the transmission of mechanical vibrations between the supporting member and casing is prevented.

13. A telephonic device comprising a supporting member, a transmitter casing having an hpening therethrough, means passing through the opening but out of contact with the walls thereof to secure the casing to the supporting member, a washer ofenergy absorbing material engaging the supporting member and the exterior of the casing, a washer of energy absorbing material intermediate the casing and the securing means and engaging the interior of the casing, and a plate engaging the last mentioned washer and the securing means but out of contact with the casing; whereby the transmission of mechanical vibrations between the supporting means and casing is prevented.

In witness whereof, I hereunto subscribe my name this 6th day of August A. D., 1918.

HOWARD C. PAULY. 

